S6055M

Overview

The Littelfuse S6055M is a standard Silicon Controlled Rectifier (SCR) from the Teccor Sxx55x series, rated for 55A RMS on-state current and available in voltage ratings up to 1000V. It utilizes a TO-218AC package with a non-isolated mounting tab common with the center lead. Key electrical characteristics include a maximum gate trigger current of 40mA, a peak non-repetitive surge current of 550A at 50Hz, and a junction-to-case thermal resistance of 0.53°C/W. The device supports an operating junction temperature range of -40°C to 125°C.

Feature Summary

• Glass-passivated junctions ensure long-term parameter stability and durability.
• Sensitive gate design allows direct interfacing with microprocessors using minimal trigger current.
• RoHS-compliant construction compatible with lead-free reflow soldering processes.

Applications

• AC solid-state switches
• Industrial power tools
• Exercise equipment
• White goods and commercial appliances

Procurement Notes

Verify the specific voltage suffix (e.g., S6055M for 600V) against the application requirements, as the Sxx55x series spans multiple voltage ratings. Confirm that the TO-218AC package dimensions align with the PCB footprint and mounting constraints. Ensure the selected variant meets the required surge current and thermal dissipation specifications for the intended load conditions.

Selection Notes

Select the appropriate voltage rating based on the peak repetitive off-state voltage required by the circuit. Consider the thermal management strategy, as the TO-218AC package relies on case cooling for high currents. Verify that the gate drive circuit can supply the necessary 40mA trigger current across the full operating temperature range. Evaluate the need for snubber networks if the circuit experiences high dv/dt conditions.

Part Context

The S6055M belongs to the Teccor Sxx55x series of 55 Amp Standard SCRs manufactured by Littelfuse. This series offers various voltage options and package types, including TO-220R, TO-263N, TO-218X, and TO-218AC. The M suffix specifically denotes the TO-218AC package configuration within this standardized product line.

Replacement Considerations

Compatible alternatives within the same series include S6055R (TO-220R package), S6055N (TO-263N package), and S6055W (TO-218X package). These variants share identical electrical ratings but differ in physical package dimensions and mounting styles. Verify mechanical fit and thermal interface requirements when substituting.